Abstract
In this paper, a dual-band dual-polarized crossed dipole antenna with good anti-interference capability is proposed for 2.4-/5-GHz WLAN applications. The proposed antenna covers the WLAN 2.4-GHz band (2.4–2.48 GHz) and 5-GHz bands (5.15–5.85 GHz) with isolation >27 dB for VSWR < 2. Without extra filtering circuit, a band-notch (3.4–3.6 GHz) is achieved by introducing the C-shaped split ring resonator (SRR) into the wideband dipole antenna. Compared with the original wideband dipole antenna, the minimum gain in the notched band is suppressed from 8 to −9 dBi and the gain in the higher band is improved from 6 to 9.7 dBi. The proposed antenna can realize a high gain of 7.85 dBi for the lower band and 9.7 dBi for the higher band. As demonstrations, two reference antennas and the proposed antennas are fabricated and measured, and the measured results agree well with the simulated ones.
Highlights
With the rapid development of wireless communication systems, such as the base station [1] and WLAN applications [2]–[5], dual-band dual-polarized (DBDP) antennas working in two or multiple bands are necessary to alleviate the multipath fading and improve the channel capacity
The results show that two working frequency bands are attributed to the radiation of the driven dipole, and the notched band are introduced by the C-shaped split ring resonator (SRR) of the coupling parasitic dipole
A DBDP crossed dipole antenna with band-notch is proposed for WLAN applications in this paper
Summary
With the rapid development of wireless communication systems, such as the base station [1] and WLAN applications [2]–[5], dual-band dual-polarized (DBDP) antennas working in two or multiple bands are necessary to alleviate the multipath fading and improve the channel capacity. Y. Zhang et al.: Dual-Polarized Band-Notched Antenna Without Extra Circuit for 2.4/5 GHz WLAN Applications bandpass filters are placed under the crossed dipoles to reduce the minimum gain to −2.66 dBi in the notched band [13]. A DBDP crossed dipole antenna is proposed to achieve a deep band-notch without extra circuit.
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